lia eurotrip

Hi, all
I'm leaving in about a month for a 23-day backpacking trip (campsites and hostels) across Europe. These are the cities, in order.

Paris
Brussels
Berlin
Copenhagen
Stockholm
Oslo
Vienna
Venice
Rimini
Geneva
Amsterdam
Paris

I don't want to hear anyone say that's too much, its not up to me, its a scheduled tour. Yes, we are only in one place for a night or two, but its meant to let us figure out where we want to go later in life. Anyway, what are the best things to buy in each city for souveniers and also to eat? And then, tell me about the shopping and how much stuff costs (for example, and this is made up, say: you can get wicked cheap shoes in Italy for about 10USD).
Thanks, everyone!